Commit Graph

23 Commits

Author SHA1 Message Date
Adrian Chadd
9844b3b3ab Allow the i2c node requirements to be slightly relaxed.
These realtek switch PHYs speak a variant of i2c with some slightly
modified handling.

From the submitter, slightly modified now that some further digging
has been done:

  The I2C framework makes a assumption that the read/not-write bit of the first
  byte (the address) indicates whether reads or writes are to follow.

  The RTL8366 family uses the bus: after sending the address+read/not-write byte,
  two register address bytes are sent, then the 16-bit register value is sent
  or received.  While the register write access can be performed as a 4-byte
  write, the read access requires the read bit to be set, but the first two bytes
  for the register address then need to be transmitted.

This patch maintains the i2c protocol behaviour but allows it to be relaxed
(for these kinds of switch PHYs, and whatever else Realtek may do with this
almost-but-not-quite i2c bus) - by setting the "strict" hint to 0.
The "strict" hint defaults to 1.

Submitted by:	Stefan Bethke <stb@lassitu.de>
2011-12-04 11:55:33 +00:00
Nathan Whitehorn
134a9563c7 Provide support for IIC_M_NOSTOP/IIC_M_NOSTART for bit-banging and
otherwise low-level controllers.

Reviewed by:	thompsa
2010-11-08 19:53:16 +00:00
Nathan Whitehorn
9f220e4d78 Revert changes accidentally committed as part of r209298. 2010-06-18 14:20:54 +00:00
Nathan Whitehorn
eaef5f0af8 Provide for multiple, cascaded PICs on PowerPC systems, and extend the
OFW interrupt map interface to also return the device's interrupt parent.

MFC after:	8.1-RELEASE
2010-06-18 14:06:27 +00:00
Warner Losh
da02572e7f Handle errors from device_get_chidlren.
Free child list when there's more children than we expected.
2008-08-23 07:38:00 +00:00
John Baldwin
313f8941e1 Add locking to the core iicbus(4) drivers:
- Add an sx lock to the iic(4) driver to serialize open(), close(), read(),
  and write and to protect sc_addr and sc_count in the softc.
- Use cdev->si_drv1 instead of using the minor number of the cdev to
  lookup the softc via newbus in iic(4).
- Store the device_t in the softc to avoid a similar detour via minor
  numbers in iic(4).
- Only add at most one instance of iic(4) and iicsmb(4) to each iicbus(4)
  instance, and do it in the child driver.
- Add a mutex to the iicbus(4) softc to synchronize the request/release bus
  stuff.
- Use __BUS_ACCESSOR() for IICBUS_ACCESSOR() instead of rolling our own.
- Add a mutex to the iicsmb(4) softc to protect softc state updated in the
  interrupt handler.
- Remove Giant from all the smbus methods in iicsmb(4) now that all the
  iicbus(4) backend is locked.
2008-08-04 21:03:06 +00:00
Warner Losh
99a1402117 MFp4: Make iicbus_trasnfer_gen suitable for bridge drivers. Use it in the
bitbang bridge.
2007-03-23 23:03:54 +00:00
Warner Losh
07defc61a9 const poison
submitted by: john wehle
2006-12-05 06:19:36 +00:00
Warner Losh
d7fac9732b Allow iic bridges to support a generalized transfer, rather than
forcing all transfers to do the start read/write stop by hand.  Some
smart bridges prefer this sort of operation, and this allows us to
support their features more easily.  When bridges don't support it, we
fall back to using the old-style opertaions.  Expand the ioctl
interface to expose this function.  Unlike the old-style interface,
this interface is thread safe, even on old bridges.
2006-07-14 23:15:06 +00:00
David E. O'Brien
aad970f1fe Use __FBSDID().
Also some minor style cleanups.
2003-08-24 17:55:58 +00:00
Nicolas Souchu
c17d43407f Major rework of the iicbus/smbus framework:
- VIA chipset SMBus controllers added
	- alpm driver updated
	- Support for dynamic modules added
	- bktr FreeBSD smbus updated but not tested
	- cleanup
2002-03-23 15:49:15 +00:00
Poul-Henning Kamp
eb95c536ad Remove unneeded #include <sys/kernel.h> 2000-04-29 15:36:14 +00:00
Poul-Henning Kamp
3389ae9350 Remove ~25 unneeded #include <sys/conf.h>
Remove ~60 unneeded #include <sys/malloc.h>
2000-04-19 14:58:28 +00:00
Matthew N. Dodd
fe0d408987 Remove the 'ivars' arguement to device_add_child() and
device_add_child_ordered().  'ivars' may now be set using the
device_set_ivars() function.

This makes it easier for us to change how arbitrary data structures are
associated with a device_t.  Eventually we won't be modifying device_t
to add additional pointers for ivars, softc data etc.

Despite my best efforts I've probably forgotten something so let me know
if this breaks anything.  I've been running with this change for months
and its been quite involved actually isolating all the changes from
the rest of the local changes in my tree.

Reviewed by:	peter, dfr
1999-12-03 08:41:24 +00:00
Nicolas Souchu
7a19171479 Sync with RELENG_3. 1999-11-01 23:15:29 +00:00
Peter Wemm
c3aac50f28 $Id$ -> $FreeBSD$ 1999-08-28 01:08:13 +00:00
Nicolas Souchu
67c13fce36 Handle correctly iicbus request/release mechanism. Add iicbus allocation
to the general purpose i/o iic(4) driver.
1999-02-13 18:01:55 +00:00
Roger Hardiman
9864d54a58 Changed to use IICBUS_REPEATED_START
Submitted by:	Changed to use IICBUS_REPEATED_START
1999-02-06 10:56:09 +00:00
Roger Hardiman
84a3aec329 Submitted by: Nicolas Souchu <nsouch@freebsd.org>
Updated to support bt848 driver and MSP3400 audio chip.
This adds changes made in 1.4.2.1 and 1.4.2.2 from RELENG_3
1999-01-28 15:59:15 +00:00
Nicolas Souchu
bf896bd0e2 Change /dev/smb and /dev/iic interface to allow user programs to interact with
devices dynamically. That means,

        + only one /dev/iic or /dev/smb device for each smb/iic bus to access
        + I2C/SMB device address must be given to any ioctl
        + new devices may be plugged and accessed after boot, which was
          impossible previously (device addresses were hardcoded into
          the kernel)
1999-01-09 18:08:24 +00:00
Nicolas Souchu
f8cf96db8f Remove broken and useless intr interface.
Submitted by: Doug Rabson <dfr@nlsystems.com>
	      Amancio Hasty <hasty@rah.star-gate.com>

Avoid compile warnings.
1998-11-22 22:01:42 +00:00
Nicolas Souchu
04f89a63cb iicbb is generic support for I2C bit-banging.
Other files: timeout management added to the I2C framework.
1998-10-31 11:31:07 +00:00
Nicolas Souchu
c3e2dc6b48 Submitted by: nsouch
Philips I2C bus generic support other new bus architecture.
1998-09-03 20:51:50 +00:00